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In general, the experimental relaxation rate constant (<jats:italic>k<\/jats:italic><jats:sub>CR<\/jats:sub>) depends on the solvent viscosity (<jats:italic>\u03b7<\/jats:italic>) and temperature (<jats:italic>T<\/jats:italic>), and is not proportional to <jats:italic>T<\/jats:italic>\/<jats:italic>\u03b7<\/jats:italic>. A theory capable of explaining the observed dependence of <jats:italic>k<\/jats:italic><jats:sub>CR<\/jats:sub> on <jats:italic>T<\/jats:italic> and <jats:italic>\u03b7<\/jats:italic> over a wide range of these variables is not available. This gap is filled here by presenting a stochastic model that includes the participation of the oligomer side chain in storing and dissipating the stresses induced by photoexcitation. The model is able to account for the softening of solute\u2013solvent interactions and its predictions are found to be in excellent agreement with the observed relaxation rate constants of a series of substituted <jats:italic>p<\/jats:italic>\u2010phenylenevinylene trimers [<jats:italic>ChemPhysChem<\/jats:italic> <jats:bold>2009<\/jats:bold>, <jats:italic>10<\/jats:italic>, 448\u2013454] on <jats:italic>T<\/jats:italic>, <jats:italic>\u03b7<\/jats:italic> and the size of the side\u2010chains.<\/jats:p>","DOI":"10.1002\/cphc.201200869","type":"journal-article","created":{"date-parts":[[2013,1,31]],"date-time":"2013-01-31T06:41:32Z","timestamp":1359614492000},"page":"583-590","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Model for Conformational Relaxation of Flexible Conjugated Polymers: Application to <i>p<\/i>\u2010Phenylenevinylene Trimers in Nonpolar Solvents"],"prefix":"10.1002","volume":"14","author":[{"given":"Adelino M.","family":"Galv\u00e3o","sequence":"first","affiliation":[]},{"given":"Roberto E.","family":"Di Paolo","sequence":"additional","affiliation":[]},{"given":"Ant\u00f3nio L.","family":"Ma\u00e7anita","sequence":"additional","affiliation":[]},{"given":"K. 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